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MOONS is a Multi-Object Optical and Near-infrared Spectrograph currently under testing as a third-generation instrument for the Very Large Telescope (VLT).The Infrared detectors used on MOONS are contained within a large, 4mx2.5mx2.5m cryostat with a 4 Tonne cold mass. Pumpdown of the chamber to 2x10-5mbar is achieved within 24 hours using two Pfeiffer 2000l/s turbo pumps. Initial Cooldown of the instrument uses a gravity fed LN2 Precool System with level sensors to automatically control the LN2 flow. When the cryostat reaches it’s assigned operating temperature an active cooling system takes over to maintain the steady-state temperature. Integration and engineering tests have been carried out to assess the performance of the Cryostat and Control System. This poster presents an overview of the system, results from integration and thermal testing of the system, along with unforeseen issues and how these challenges were resolved.
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Chris Waring, Jonathan Strachan, Oscar Gonzalez, "Performance of MOONS cryostat and control system," Proc. SPIE 13096, Ground-based and Airborne Instrumentation for Astronomy X, 130962J (19 July 2024); https://doi.org/10.1117/12.3020306